Digital BW, The Print

I am looking for advice for the 3000. I purchased a used 3000 about a
year and a half ago, after some trial and error I managed to print a
sizable quantity of work on the old Piezography inks. At about the
time the new piezotones came out I had a show to print for, I was able
to get some fair prints but the museum black kept clogging. I drove it
down to Ardito's in N.Y., I live in R.I., and he rebuilt it saying I
needed new heads, among other things. I got it up and running and
still had the same problem. After much frustration and no success I
purchased another 3000 and printed the show on this one with the old
Piezo/ R-9 inks. After the show I then tried the newer 3000 w/ the
piezotones and had the same problem. After much back and forth w/ Dana
from Ink Jet Mall she finally told me the 3000 is the least
successful machine for the piezotones. I next went back to the old
Piezo's, yes I bought 2 new sets from the B+W guys and got clogging on
both machines. I have now brought them both in for service, as I could
not completely clean them, and had the newer one rebuilt. I gave the
inks to the repair people and they cleaned and tested ea. printer,
telling me the inks are no good as they got bad, yet inconsistent
checks on each machine, at different times.
 So my questions are;
  1) What are my options in terms of other inks
  2) Are other people having any luck w/ the 3000? 
  3) Help, Help, Help
 I must say, I want 16X20 prints, and when they work right I am
stunned at what I get.
 Thanks
 Steve Mason